diff --git a/codalab/apps/web/models.py b/codalab/apps/web/models.py
index 33c3710f3..cefeec1ad 100644
--- a/codalab/apps/web/models.py
+++ b/codalab/apps/web/models.py
@@ -891,7 +891,7 @@ class CompetitionPhase(models.Model):
     color = models.CharField(max_length=24, choices=COLOR_CHOICES, blank=True, null=True)
 
     max_submission_size = models.PositiveIntegerField(
-        default=30,
+        default=300,
         validators=[
             MaxValueValidator(10000),
             MinValueValidator(0)